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1.
A man, usually by the name of Dan, Daniel, Danny, who is know for his heroic acts.

A man named Daniel who is known by the ladies as Dan the Man for the size of his large penis.
That nigga Dan the Man he fucked 3 bitches at once
by DantheMan101 March 16, 2007
 
2.
A guy that's good in bed, despite a less than great appearance.
He sure looked uncool, but he was Dan The Man in bed. He fucked me all night long!
by H-eather! January 10, 2008